R’ Eliyahu Lopian once said that a person is apt to delude himself into thinking that he has overcome his tendency to become angry.  In reality he might manage to remain calm only because no one has provoked him.  The true test of a person’s propensity toward anger is judged by his behavior in the circle of his own family, which will undoubtedly provide opportunities for anger.  ~ Lev Eliyahu as quoted by R’ Zelig Pliskin